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2011•Journal of Guilin University of TechnologyRequires access

Cultivation and Characteristics of Aerobic Granular Sludge

LI Jin-chenga

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Abstract

The successful cultivation of aerobic granular sludge in sequencing batch reactor(SBR) is performed in synthetic domestic wastewater and conventional flocculent activated sludge as aerobic granular sludge.According to second nucleation theory,aerobic granular sludge can be cultured by decreasing the sludge sedimentation time and increasing COD loading rate resulting in the selective pressure.The aerobic granular sludge has very regular structure,better settling performance,high bioactivity,and an orange yellow appearance with a size of 0.5 to 1.0 mm,SVI of 40 mL/g and MLSS of 7 037 mg/L.With average removal rate of ammonia nitrogen,COD is above 95% and that of TP is above 80%.

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What this paper is about

The successful cultivation of aerobic granular sludge in sequencing batch reactor(SBR) is performed in synthetic domestic wastewater and conventional flocculent activated sludge as aerobic granular sludge.According to second nucleation theory,aerobic granular sludge can be cultured by decreasing the sludge sedimentation time and increasing COD loading rate resulting in the selective pressure.The aerobic granular sludge has very regular structure,better settling performance,high bioactivity,and an orange yellow appearance with a size of 0.5 to 1.0 mm,SVI of 40 mL/g and MLSS of 7 037 mg/L.With average removal rate of ammonia nitrogen,COD is above 95% and that of TP is above 80%.

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Available abstract

The successful cultivation of aerobic granular sludge in sequencing batch reactor(SBR) is performed in synthetic domestic wastewater and conventional flocculent activated sludge as aerobic granular sludge.According to second nucleation theory,aerobic granular sludge can be cultured by decreasing the sludge sedimentation time and increasing COD loading rate resulting in the selective pressure.The aerobic granular sludge has very regular structure,better settling performance,high bioactivity,and an orange yellow appearance with a size of 0.5 to 1.0 mm,SVI of 40 mL/g and MLSS of 7 037 mg/L.With average removal rate of ammonia nitrogen,COD is above 95% and that of TP is above 80%.

Key concepts: Settling, Sequencing batch reactor, Pulp and paper industry, Wastewater, Chemistry, Activated sludge, Sedimentation, Nitrogen

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